Longitudinal z Score Distribution in Sonographic Fetal Biometry: Influence of Examiner and Experience

Objectives To analyze the influence of examiners and their experience on the quality of biometric measurements via the evolution of z scores in a longitudinal multicenter study. Methods This retrospective study included 4607 sonographic fetal biometric examinations performed by 18 examiners at the b...

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Bibliographic Details
Published in:Journal of ultrasound in medicine 2017-05, Vol.36 (5), p.1021-1028
Main Authors: Faschingbauer, Florian, Heimrich, Jutta, Raabe, Eva, Kehl, Sven, Schneider, Michael, Schmid, Matthias, Beckmann, Matthias W., Schild, Ralf L., Mayr, Andreas
Format: Article
Language:English
Subjects:
biometry
Biometry - methods
Clinical Competence - statistics & numerical data
Cross-Sectional Studies
examiner experience
Female
Femur - anatomy & histology
Femur - embryology
Fetal Development - physiology
Fetal Weight - physiology
fetal weight estimation
Humans
Infant, Newborn
Longitudinal Studies
Male
obstetric ultrasound
Pregnancy
Reproducibility of Results
Retrospective Studies
sonography
Ultrasonography, Prenatal - statistics & numerical data
z scores
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Summary:Objectives To analyze the influence of examiners and their experience on the quality of biometric measurements via the evolution of z scores in a longitudinal multicenter study. Methods This retrospective study included 4607 sonographic fetal biometric examinations performed by 18 examiners at the beginning of their sonography training. To analyze the quality of biometric measurements, z scores comparing the individual measurements with the expected values from a standard population were computed. To investigate the effect of examiners and their experience, we applied a multivariable regression analysis via generalized additive mixed models. Results Mean z scores for biparietal diameter, abdominal circumference, and femur length were statistically different from the expected value of 0 (P 
ISSN:0278-4297
1550-9613
DOI:10.7863/ultra.16.06031